Production method of high-quality blended yarn

Abstract

The invention discloses a production method of high-quality blended yarns, which comprises the following steps of: sequentially and independently opening and cleaning polyester and viscose to prepare polyester and viscose flows, conveying the polyester and viscose flows to a mixed cotton feeder according to a required mixing proportion by a cotton distributor, and arranging a rear cotton box, a middle cotton box and a front cotton box in the mixed cotton feeder, mixed fibers flow through the rear upper cotton box, are vibrated, overturned and mixed, then are conveyed to the rear lower cotton box, are tiled in the rear lower cotton box at the same height, are flatly laid on the cotton conveying curtain, are conveyed to the middle cotton box at the uniform density, and are grabbed in the middle cotton box through the brad curtain in the thickness direction, so that vertical grabbing and mixing of the two types of fibers after being flatly laid are realized; the cotton fibers are conveyed into a front cotton box through a brad curtain, are subjected to uniform height arrangement in the front cotton box, then are subjected to vibration arrangement and are uniformly output, and then directly enter a single beater lapper to prepare polyester-viscose mixed rolls, and the polyester-viscose mixed rolls are subjected to fine carding, impurity removal and slivering of a carding machine, uniform arrangement of two drawing frames, drafting and fine drawing of a roving frame, twisting and winding to obtain polyester-viscose mixed rolls. And the required blended yarn is formed by drafting, fine-drawing, twisting and winding of a spinning frame.

Description

Technical Field

[0001] The invention relates to the technical field of novel yarns, in particular to a method for producing high-quality blended yarns. Background Art

[0002] With the development of social economy, people's living standards are constantly improving. For textiles used in clothing, in addition to the pursuit of wearing comfort, people are paying more and more attention to their fashion and functionality, pursuing unique styles and various functions, such as antibacterial and antistatic functions. In order to meet this demand of consumers, it has become an important task for the textile industry to continuously develop new yarns and fabrics. With the development of science and technology, the competition in the textile market is becoming more and more fierce. In order to maximize profits, various manufacturers are constantly developing in the direction of high-end, high-grade, good technical content and high added value. Summary of the invention

[0003] The object of the present invention is to provide a method for producing high-quality blended yarn, in which a polyester fiber flow and a viscose fiber flow which have been grasped by a cotton grasping machine, mixed and opened and removed impurities by a mixing and opening machine, and opened, combed and removed impurities by a combing needle and beating cotton opening machine are fully mixed and uniformly output in a mixing cotton feeding machine through a cotton distributor, thereby achieving efficient and uniform mixing of the two fibers, thereby realizing the development of blended yarn with excellent yarn quality.

[0004] The present invention provides a method for producing high-quality blended yarn, comprising the following steps:

[0005] Step 1: Cotton blending: When blending cotton, the origin is selected as the main component to keep the spinning production and yarn quality stable. 3-5 groups of marks with similar properties are used as the main components in the blending cotton composition, and the main components account for more than 70%. The number of blending cotton teams is selected to be 6-8 teams;

[0006] Step 2: Opening and cleaning: The selected polyester fiber and viscose fiber are grabbed by the plucking machine in the required mixing ratio, the mixing and opening machine mixes, opens and removes impurities on the grabbed fibers, and the combing and beating cotton opening machine combs, opens and removes impurities on the fibers transported by the cotton opening machine, so as to obtain polyester fiber flow and viscose fiber flow respectively;

[0007] Step 3: Polyester-viscose mixed rolls: The polyester fiber flow and viscose fiber flow obtained in the first step are conveyed to the mixed cotton feeder through the electric cotton distributor according to the required mixing ratio of the two fibers in the blended yarn. The mixed cotton feeder is provided with a rear cotton box, a middle cotton box, and a front cotton box in sequence from back to front along the direction of fiber conveying. The rear cotton box includes a rear upper cotton box and a rear lower cotton box. A cotton conveying curtain is provided between the rear lower cotton box and the middle cotton box, and a corner nail curtain is provided between the middle cotton box and the front cotton box.

[0008] The mixed fibers are transported through the upper rear cotton box for vibration, flipping and mixing, and then transported to the lower rear cotton box. After being arranged in a uniform height in the lower rear cotton box, they are laid flat on the cotton feeding curtain and transported to the middle cotton box with uniform density. In the middle cotton box, they are grabbed along the thickness direction by the corner nail curtain to achieve vertical grabbing and mixing of the two types of fibers after being laid flat. They are then transported to the front cotton box by the corner nail curtain, and after being arranged in a uniform height in the front cotton box, they are vibrated and arranged for uniform output.

[0009] The output mixed fiber flow directly enters the single beater roll forming machine to make polyester-viscose mixed rolls;

[0010] Step 4: Carding: Use a carding machine to finely card, open, remove impurities, and form the polyester-viscosity mixed roll obtained in the third step to obtain a polyester-viscosity mixed raw sliver with a strip structure;

[0011] Step 5: Drawing: The polyester-viscosity mixed raw sliver obtained in the fourth step is drawn and thinned through two drawing steps, and then re-drawn to obtain polyester-viscosity mixed cooked sliver with improved sliver uniformity;

[0012] Step 6: roving: the polyester-viscosity mixed sliver obtained in the fifth step is drawn, thinned, twisted and wound by a roving machine to obtain polyester-viscosity mixed roving;

[0013] Step 7: Spinning: The polyester-viscose mixed roving obtained in the sixth step is drawn, thinned, twisted and wound on a spinning machine to obtain the required blended yarn.

[0014] A method for producing high-quality blended yarn as described above, wherein, preferably, the electric cotton distributor includes a front branch pipe and a rear merging pipe, the front branch pipe includes a left front branch pipe and a right front branch pipe, the rear end of the left front branch pipe is connected to the combing needle and beating cotton opening machine in polyester cotton opening, the rear end of the right front branch pipe is connected to the combing needle and beating cotton opening machine in viscose cotton opening, the front ends of the left front branch pipe and the right front branch pipe are interconnected with the rear end of the rear merging pipe, a left cotton suction fan is provided at the intersection of the left front branch pipe and the rear merging pipe, the cotton suction negative pressure of the left cotton suction fan is controlled by the left control valve, and a right cotton suction fan is provided at the intersection of the right front branch pipe and the rear merging pipe, the cotton suction negative pressure of the right cotton suction fan is controlled by the right control valve.

[0015] A method for producing high-quality blended yarn as described above, wherein preferably, a condenser is provided above the rear upper cotton box.

[0016] A method for producing high-quality blended yarn as described above, wherein preferably, a vibrating rod is provided in the rear upper cotton box.

[0017] A method for producing high-quality blended yarn as described above, wherein, preferably, a first output roller is provided at the bottom of the rear upper cotton box, and the first output roller is controlled by a first switch.

[0018] A method for producing high-quality blended yarn as described above, wherein preferably, a first photoelectric tube is arranged in the rear lower cotton box, and when the first photoelectric tube detects that the height of the mixed fiber layer in the rear lower cotton box is less than a set value, the first switch controls the first output roller to rotate so as to realize the conveying of the polyester and viscose mixed fibers in the rear upper cotton box to the rear lower cotton box, and when the first photoelectric tube detects that the height of the mixed fiber layer in the rear lower cotton box is greater than a set value, the first switch controls the first output roller to stop rotating so as to stop the conveying of the polyester and viscose mixed fibers in the rear upper cotton box.

[0019] A method for producing high-quality blended yarn as described above, wherein, preferably, a second output roller is arranged at the bottom of the rear lower cotton box, the second output roller is controlled by a second switch, and the cotton delivery curtain is arranged at the bottom of the second output roller, the rear end of the cotton delivery curtain is located in the rear lower cotton box, and the front end is located in the middle cotton box.

[0020] A method for producing high-quality blended yarn as described above, wherein, preferably, the corner nail curtain is arranged in the middle cotton box, the corner nail curtain is arranged in a vertically inclined state, the corner nail curtain is driven to rotate by a second motor, the angle between the bottom end of the corner nail curtain and the front end of the cotton feeding curtain is between 90-120 degrees, the top end of the corner nail curtain is located in the front cotton box, and a cotton stripping roller is arranged on the upper part of the top end of the corner nail curtain, and the cotton stripping roller is controlled by a third switch to rotate or stop rotating.

[0021] A method for producing high-quality blended yarn as described above, wherein preferably, a second photoelectric tube is arranged in the front cotton box, and when the second photoelectric tube detects that the height of the mixed fiber layer in the front cotton box is less than a set value, the third switch controls the cotton stripping roller to rotate so as to realize the conveying of the polyester-viscose mixed fiber grabbed by the corner nail curtain into the front cotton box, and when the second photoelectric tube detects that the height of the mixed fiber layer in the front cotton box is greater than a set value, the third switch controls the cotton stripping roller to stop rotating so as to stop the conveying of the polyester-viscose mixed fiber in the middle cotton box.

[0022] A method for producing high-quality blended yarn as described above, wherein preferably, a vibration plate is provided in the front cotton box.

[0023] Compared with the prior art, the present invention adopts the polyester fiber flow and viscose fiber flow which are respectively grasped by the cotton grasping machine, mixed and opened and removed by the mixing and opening machine, and opened, combed and removed by the combing needle and beater cotton opener, and then fully mixed and evenly output in the mixing cotton feeder through the cotton distributor to form a mixed roll. The mixed roll is combed together to achieve efficient and uniform mixing of the two fibers. Compared with traditional strip mixing, the present invention achieves mixing of the two fibers before combing, so that a more uniform mixing effect of the two fibers can be achieved through combing and subsequent drawing. Compared with direct mixing at the raw material stage, this patent adopts two fibers that are independently opened and cleaned, so as to achieve flexible opening effect according to the characteristics of the two fibers, reduce damage to the fibers, and thus achieve the development of blended yarn with excellent yarn quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the mixed cotton feeder provided in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1-rear upper cotton box, 2-rear lower cotton box, 3-middle cotton box, 4-front cotton box, 5-left front branch pipe, 6-right front branch pipe, 7-left cotton suction fan, 8-right cotton suction fan, 9-rear converging pipe, 10-cotton condenser, 11-vibrating rod, 12-first output roller, 13-first switch, 14-first photoelectric tube, 15-second output roller, 16-second switch, 17-cotton delivery curtain, 18-corner nail curtain, 19-stripping roller, 20-third switch, 21-vibrating plate, 22-second photoelectric tube, 23-cotton output roller. DETAILED DESCRIPTION

[0027] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0028] The present invention provides a method for producing high-quality blended yarn, wherein polyester fiber and viscose fiber are independently grasped by a cotton grasping machine, mixed and opened and removed by a mixed cotton opening machine, and opened, combed and removed by a combing needle and beater cotton opening machine in sequence, and then the obtained polyester fiber flow and viscose fiber flow are transported to a mixed cotton feeding machine through a cotton distributor according to the required mixing ratio of the two fibers in the blended yarn, wherein a rear cotton box, a middle cotton box and a front cotton box are arranged in the mixed cotton feeding machine, wherein the rear cotton box comprises a rear upper cotton box and a rear lower cotton box, wherein the transported polyester fiber flow and viscose fiber flow are firstly vibrated and mixed in the rear upper cotton box, and then the height of the mixed fiber layer entering the cotton box is controlled by a photoelectric tube in the rear lower cotton box to control the fiber output density, and the mixed fiber in the rear lower cotton box is transported into the middle cotton box through a cotton feeding curtain, During this period, the output rollers of the rear box are controlled to stop and rotate by the rocking plate and rake mechanism to realize the uniform control of the output density of the mixed fiber. The mixed fiber in the middle and lower cotton box is grabbed by the corner nail curtain and driven to enter the front cotton box. The mixed fiber is caused to roll during the grabbing process to realize further uniform mixing of the two fibers. The height of the mixed fiber layer entering the cotton box is controlled by the photoelectric tube in the front cotton box to control the fiber output density, and then the mixed fiber is uniformly controlled again. The fiber output uniformly after mixing is uniformly rolled by the rolling machine, the carding machine is finely combed, impurities are removed, and the strips are formed. The two drawing machines are evenly arranged, the roving machine is stretched, thinned, twisted and wound into roving, and the spun yarn is stretched, thinned, twisted and wound into spun yarn, and finally the desired blended yarn is obtained, including the following steps:

[0029] Step 1: Cotton matching: When matching cotton, the origin is selected as the main body to keep the spinning production and yarn quality stable. 3-5 groups of marks with similar properties are used as the main components in the cotton matching ingredients. The main components account for more than 70%, and the number of cotton matching teams is selected from 6 to 8.

[0030] The second step: cleaning: the selected polyester fibers are sequentially grabbed by the cotton grabber according to the required mixing ratio, the mixed cotton opening machine mixes, opens and removes impurities on the grabbed polyester fibers, and the combing needle and beater cotton opening machine combs, opens and removes impurities on the polyester fibers conveyed by the cotton opening machine, so as to obtain a polyester fiber flow; the selected viscose fibers are sequentially grabbed by the cotton grabber according to the required mixing ratio, the mixed cotton opening machine mixes, opens and removes impurities on the grabbed viscose fibers, and the combing needle and beater cotton opening machine combs, opens and removes impurities on the viscose fibers conveyed by the cotton opening machine, so as to obtain a viscose fiber flow.

[0031] The cleaning process follows the technological principle of "taking more bales, fine cotton picking, gradual loosening, early dropping and less breaking, combing instead of beating, less fiber damage"; in the process of cotton picking, the cotton feeding work is automated and the raw cotton is initially loosened and mixed. In order to improve the loosening effect and reflect the principle of "less grabbing", the distance that the serrated blade extends out of the rib should not be too large, and it should be controlled within 1 to 6 mm according to the raw material conditions. When the cotton picking trolley descends a large distance, it is beneficial to increase the output of the cotton picking machine, but it has an impact on the loosening effect and increases power consumption. It should be controlled within the range of 2 to 4 mm / time; when the running speed of the cotton picking trolley is high, the cotton picking machine has a high output and grabs more raw materials per unit time, which is beneficial to improve the mixing effect, but the loosening effect is poor. The trolley rotation speed is set at 1. The speed of the cotton grabbing beater is between 730 and 750 r / min. The mixing and opening machine feeds the raw materials grabbed by the cotton grabbing machine through the suction of the cotton condenser 10, and mixes, highly opens and removes impurities from the fed polyester fiber or viscose fiber. The impurity removal rate is relatively high, and the distances between the dust bars and the dust bars and between the dust bars and the beaters are adjustable by setting an external adjustment device. The combing needle cotton opening machine further loosens and removes impurities from the initially opened fibers by grabbing and tearing the polyester fibers or viscose fibers with the beaters on the outer circumference of the combing needle drum.

[0032] Step 3: Polyester-viscose mixed roll: The polyester fiber flow and viscose fiber flow obtained in the second step are transported to the mixed cotton feeder according to the required mixing ratio of the two fibers in the blended yarn through the electric cotton distributor. Figure 1As shown, the electric cotton distributor includes a front branch pipe and a rear merging pipe 9, the front branch pipe includes a left front branch pipe 5 and a right front branch pipe 6, the rear end of the left front branch pipe 5 is connected to the combing needle and beater cotton opener in the polyester cotton opening, and the rear end of the right front branch pipe 6 is connected to the combing needle and beater cotton opener in the viscose cotton opening, the front ends of the left front branch pipe 5 and the right front branch pipe 6 are interconnected with the rear end of the rear merging pipe 9, a left cotton suction fan 7 is arranged at the intersection of the left front branch pipe 5 and the rear merging pipe 9, and the cotton suction negative pressure of the left cotton suction fan 7 is controlled by the left control valve, and a right cotton suction fan 8 is arranged at the intersection of the right front branch pipe 6 and the rear merging pipe 9, and the cotton suction negative pressure of the right cotton suction fan 8 is controlled by the right control valve. When in use, the cotton suction negative pressure of the left cotton suction fan 7 is controlled by the left control valve, and the right control valve controls the right cotton suction The suction negative pressure of the fan 8 is realized, thereby realizing the amount of polyester fiber sucked by the left cotton suction fan 7 and the amount of viscose fiber sucked by the right cotton suction fan 8. The front end of the rear merging pipe 9 is interconnected with the mixed cotton feeder. The mixed cotton feeder is provided with a rear cotton box, a middle cotton box 3, and a front cotton box 4 in sequence from back to front along the direction of fiber conveying. The rear cotton box includes a rear upper cotton box 1 and a rear lower cotton box 2. A condenser 10 is arranged above the rear upper cotton box 1. The polyester fiber and viscose fiber conveyed by the electric cotton feeder are conveyed to the rear upper cotton box 1 of the mixed cotton feeder through the suction effect of the condenser 10. A vibrating rod 11 is arranged in the rear upper cotton box 1. The polyester fiber and viscose fiber entering the rear upper cotton box 1 are vibrated and flipped under the action of the vibrating rod 11, thereby During the multiple flipping processes, the first uniform mixing of the two fibers is achieved. A first output roller 12 is arranged at the bottom of the upper rear cotton box 1. The first output roller 12 is controlled by a first switch 13, thereby realizing the output control of the fibers in the upper rear cotton box 1. The lower rear cotton box 2 is located directly below the upper rear cotton box 1. A first photoelectric tube 14 is arranged in the lower rear cotton box 2. When the first photoelectric tube 14 detects that the height of the mixed fiber layer in the lower rear cotton box 2 is less than a set value, the first switch 13 controls the first output roller 12 to rotate, thereby realizing the polyester and viscose mixed fiber in the upper rear cotton box 1 is transported to the lower rear cotton box 2. When the first photoelectric tube 14 detects that the height of the mixed fiber layer in the lower rear cotton box 2 is greater than a set value, the first switch 13 The first output roller 12 is controlled to stop rotating, thereby stopping the conveying of the polyester and viscose mixed fiber in the rear upper cotton box 1, and then realizing the height control of the mixed fiber layer in the rear lower cotton box 2, thereby controlling the fiber output density of the rear lower cotton box 2 to be uniform. A second output roller 15 is arranged at the bottom of the rear lower cotton box 2, and the second output roller 15 is controlled by a second switch 16, thereby realizing the output control of the fiber in the rear lower cotton box 2. A cotton delivery curtain 17 is arranged at the bottom of the second output roller 15, and the rear end of the cotton delivery curtain 17 is located in the rear lower cotton box 2, and the front end is located in the middle cotton box 3. The cotton delivery curtain 17 is driven to rotate by the first motor, thereby driving the polyester-viscose mixed fiber flow output by the second output roller 15 in the rear lower cotton box 2 to enter the middle cotton box 3 from the rear lower cotton box 2.In this process, the second switch 16 is used to control the rotation and stop of the second output roller 15 to realize the uniform output of the polyester-viscose mixed fiber flow output by the cotton conveying curtain 17. A corner nail curtain 18 is arranged in the middle cotton box 3. The corner nail curtain 18 is arranged in a vertically inclined state. The corner nail curtain 18 is driven to rotate by the second motor. The angle between the bottom end of the corner nail curtain 18 and the front end of the cotton conveying curtain 17 is between 90 and 120 degrees. The top end of the corner nail curtain 18 is located in the front cotton box 4. The polyester-viscose mixed fiber flow conveyed by the cotton conveying curtain 17 is then grabbed by the corner nail curtain 18 along the thickness direction. In the process, the two kinds of fibers are vertically grasped and mixed after being laid flat, and the polyester-viscose mixed fiber flow is caused to roll during the grasping process, so as to achieve the second uniform mixing of the two kinds of fibers. A stripping roller 19 is arranged on the upper part of the top of the corner nail curtain 18. The stripping roller 19 is controlled by the third switch 20 to rotate or stop rotating. When the stripping roller 19 rotates, the polyester-viscose mixed fiber flow grasped by the corner nail curtain 18 is stripped into the front cotton box 4. When the stripping roller 19 stops rotating, the polyester-viscose mixed fiber flow grasped by the corner nail curtain 18 continues to move along the corner nail curtain 18. The second photoelectric tube 22 is arranged in the front cotton box 4. When the second photoelectric tube 22 detects that the height of the mixed fiber layer in the front cotton box 4 is less than the set value, the third switch 20 controls the stripping roller 19 to rotate so as to realize the polyester-viscose mixed fiber grabbed by the corner nail curtain 18 to be transported to the front cotton box 4. When the second photoelectric tube 22 detects that the height of the mixed fiber layer in the front cotton box 4 is greater than the set value, the third switch 20 controls the stripping roller 19 to stop rotating so as to stop the transportation of the polyester-viscose mixed fiber in the middle cotton box 3, and then realize the mixed fiber in the front cotton box 4. The height of the mixed fiber layer is controlled to control the uniform fiber output density of the front cotton box 4. A vibration plate 21 is arranged in the front cotton box 4. The vibration of the vibration plate 21 realizes the vibration output of the polyester-viscosity mixed fiber flow in the front cotton box 4. A cotton discharge roller 23 is arranged at the lower part of the vibration plate 21. The uniform output of the polyester-viscosity mixed fiber flow is realized through the cotton discharge roller 23. The polyester-viscosity mixed fiber flow uniformly output by the mixed cotton feeder is then transported to the single-beater roll forming machine through the cotton conveying pipeline, and the polyester-viscosity mixed fiber flow is further loosened and impurities are removed, and a polyester-viscosity mixed roll is made for use by the carding machine.

[0033] Step 4: Combing: Use a carding machine to finely comb, open, remove impurities, and form the polyester-viscosity mixed roll obtained in the third step to obtain a polyester-viscosity mixed raw sliver with a strip structure; the carding machine should improve the mechanical state of the cotton carding, do a good job of "five fronts and one accuracy", and adopt the process principle of "high speed, tight spacing, and strong combing"; each channel component is required to be smooth and oil-free, and there is no hanging and accumulation of flowers during operation, so as to produce raw sliver with clear cotton mesh, uniform strips, small weight unevenness and few cotton knots and impurities; in terms of technology, the saw teeth or needle clothing are required to be sharp, the spacing is accurate, and the speed is reasonable to ensure that the moisture content and impurity content of the cotton roll are appropriate, so that the cotton roll structure is good and the quality is stable.

[0034] The fifth step: drawing: the polyester-viscose mixed raw sliver obtained in the fourth step is drawn and thinned through two drawing passes, and then re-combined to obtain a polyester-viscose mixed cooked sliver with improved sliver uniformity; the two mixing passes adopt 8 combining threads, which is conducive to controlling the unevenness of the fine yarn below 2%. The quantitative selection of the two drawing passes adopts the design principle of reducing the number of passes one by one. Since the polyester-viscose fiber has good uniformity, longer length, and more curls than cotton fiber, the friction factor between the fiber and the metal is larger. Therefore, a larger drafting force is used in the drawing process, and the process adopts the design principle of "heavy pressure, large spacing, smooth channel, anti-entanglement and anti-blocking" to ensure the quality of the fiber strip; the second drawing pass is a quality control process, focusing on controlling the CV value of the sliver and the weight unevenness rate. Because the drafting in the rear area is small, the concentrated front area drafting is adopted, the roller spacing in the rear area can be increased, and the roller spacing in the front area should be tightly controlled to strengthen the control of the pressure bar on the slow fiber and move the speed change point forward.

[0035] Step 6: Roving: The polyester-viscosity mixed sliver obtained in the fifth step is drawn, thinned, twisted and wound by the roving machine to obtain the polyester-viscosity mixed roving. On the one hand, the roving machine should continue to improve the straightness of the fiber by drawing, and on the other hand, it should be twisted and assembled to create conditions for the large drawing of the spinning machine. The roving process design is mainly aimed at improving the quality of the roving, so as to achieve stable elongation, small weight difference, uniform sliver, compact structure and good forming; the roving should improve the mechanical flat repair quality, the drafting gear should be engaged normally, the roller bending and the rubber roller eccentricity should meet the requirements, and there should be no oil shortage; the cotton collector opening is consistent and the installation position is appropriate, the rubber roller rotates flexibly, the starting position of the iron gun is accurate, the elongation is stable, the spindle shell is kept smooth, the operation is normal and the channel is free of hanging flowers, so as to improve Improve the dryness of coarse yarn, reduce weight unevenness and reduce yarn defects; the drafting system adopts four-roller double short apron drafting, the main drafting is in the middle area, and the apron control element composed of upper and lower pins, upper and lower aprons, upper pin spring and spacing block is set. The front area is 1.05-1.1 times of tension drafting, and the rear area is 1.06-1.53 ​​times of tension drafting. The function of the rear area is to straighten the fibers in the fed polyester-viscose mixed cooked sliver, generate slight tension, and then continuously pass through the main drafting area of ​​the upper and lower aprons in a parallel state. The front area is the finishing area, and the middle area is the main drafting area. There is no collector in the main drafting area, and collectors are set after the other three rows of rollers. It has the characteristics of no bundling in the drafting area and no drafting in the bundling area, making the fiber movement more stable and reliable.

[0036] Step 7: Spinning: The polyester-viscose mixed roving obtained in the sixth step is drawn, fined, twisted and wound on the spinning machine to obtain the required blended yarn; the purpose of the spinning process design is to improve the quality of the spinning, and the drafting multiple must be reasonably configured. Under the premise of adapting the drafting force, the process principle of "large gauge, heavy pressure, small back zone drafting, small jaw" is adopted, and reasonable steel collars and wire rings are used. According to the purpose of the fabric, a reasonable twist coefficient is configured to improve the yarn strength and yarn uniformity, reduce yarn breakage, and reduce yarn defects; the drafting system adopts a three-roller long and short leather ring double-zone drafting structure The task of the rear zone drafting is to prepare for the front zone drafting, to give full play to the role of the rubber ring in controlling the movement of the fiber, and to make the slivers fed into the front zone as compact as possible, so as to increase the drafting multiple of the front zone and improve the yarn quality. The rear zone drafting of the spinning frame uses V-type drafting, and the drafting multiple of the rear zone is relatively small to provide the front zone with uniform yarn structure; because the spinning frame uses V-type drafting to increase the control of the fiber, the center distance of the rear zone rollers is appropriately reduced, and the front drafting process adopts a small roller center distance to strengthen the effective control of the floating fiber and reduce the unevenness of the spinning.

[0037] Taking the preparation of Siro blended yarn with a linear density of 14.6tex (40S) and a blending ratio of T / R65 / 35 as an example, the corresponding process parameters are as follows:

[0038] (1) Raw material selection

[0039] Main indicators of selected polyester

[0040]

[0041] Main indicators of selected viscose

[0042]

[0043] Polyester blending and cotton bale performance indicators

[0044]

[0045]

[0046] Viscose blending and cotton bale performance indicators

[0047]

[0048] (2) The process flow is designed as follows

[0049] The present invention:

[0050] Polyester T: FA002 plucking machine → FA035E mixed cotton opening machine → FA106 combing needle and beater cotton opening machine Viscose R: FA002 plucking machine → FA035E mixed cotton opening machine → FA106 combing needle and beater cotton opening machine

[0051] Polyester-viscose blend: electrical cotton distributor → mixed cotton feeder → A076 roll forming machine → FA201B carding machine → FA306 drawing frame (one) → FA311F drawing frame (two) → FA458 roving frame → FA506 spinning frame

[0052] Traditional strip mix:

[0053] Viscose R: FA002 plucker → FA035E mixed cotton opener → FA106 needle beater opener → FA046A vibrating cotton box feeder → A076 roll forming machine → FA201B carding machine

[0054] Polyester T: FA002 plucker → FA035E mixed cotton opener → FA106 needle beater opener → FA046A vibrating cotton box feeder → A076 lap forming machine → FA201B carding machine → FA306 drawing frame

[0055] Polyester-viscose blend: FA306 drawing frame (one) → FA306 drawing frame (two) → FA311F drawing frame (three) → FA458 roving frame → FA506 spinning frame

[0056] (3) Design of key process parameters

[0057] Viscose cleaning:

[0058] FA002 disc type cotton plucking machine

[0059]

[0060] FA035E Mixed Cotton Opening Machine

[0061]

[0062] FA106 Needle and Beater Cotton Opening Machine

[0063]

[0064] Polyester cleaning:

[0065] FA002 disc type cotton plucking machine

[0066]

[0067] FA035E Mixed Cotton Opening Machine

[0068]

[0069] FA106 Needle and Beater Cotton Opening Machine

[0070]

[0071]

[0072] Mixed into rolls:

[0073] Mixed cotton feeder

[0074]

[0075] A076E Single Beater Rolling Machine

[0076]

[0077] Carding:

[0078] FA201B carding machine

[0079]

[0080]

[0081] Drawing:

[0082] Drawing process design table

[0083]

[0084] Roving:

[0085] Roving frame process design table

[0086]

[0087]

[0088] Fine yarn:

[0089] Spinning machine process design table

[0090]

[0091] (4) Yarn quality test:

[0092] Bobbin quality index

[0093]

[0094] It is obvious from the test results that, compared with the blended yarn processed by traditional yarn blending, the comprehensive quality of the blended yarn processed by the production method of the present invention is improved, especially the CV of the yarn is improved, the defects of the yarn are reduced, and the breaking strength is improved. This is because the present invention opens and cleans the two fibers separately and then mixes them, so that the two fibers are warped together to achieve a more uniform mixing effect.

[0095] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A method for producing high-quality blended yarn, characterized in that: The following steps are involved: Step 1: Cotton blending: When blending cotton, the origin is selected as the main component to keep the spinning production and yarn quality stable. 3-5 groups of marks with similar properties are used as the main components in the blending cotton composition, and the main components account for more than 70%. The number of blending cotton teams is selected to be 6-8 teams; Step 2: Opening and cleaning: The selected polyester fiber and viscose fiber are grabbed by the plucking machine in the required mixing ratio, the mixing and opening machine mixes, opens and removes impurities on the grabbed fibers, and the combing and beating cotton opening machine combs, opens and removes impurities on the fibers transported by the cotton opening machine, so as to obtain polyester fiber flow and viscose fiber flow respectively; Step 3: Polyester-viscose mixed rolls: The polyester fiber flow and viscose fiber flow obtained in the first step are conveyed to the mixed cotton feeder through the electric cotton distributor according to the required mixing ratio of the two fibers in the blended yarn. The mixed cotton feeder is provided with a rear cotton box, a middle cotton box, and a front cotton box in sequence from back to front along the direction of fiber conveying. The rear cotton box includes a rear upper cotton box and a rear lower cotton box. A cotton conveying curtain is provided between the rear lower cotton box and the middle cotton box, and a corner nail curtain is provided between the middle cotton box and the front cotton box. The mixed fibers are transported through the upper rear cotton box for vibration, flipping and mixing, and then transported to the lower rear cotton box. After being arranged in a uniform height in the lower rear cotton box, they are laid flat on the cotton feeding curtain and transported to the middle cotton box with uniform density. In the middle cotton box, they are grabbed along the thickness direction by the corner nail curtain to achieve vertical grabbing and mixing of the two types of fibers after being laid flat. They are then transported to the front cotton box by the corner nail curtain, and after being arranged in a uniform height in the front cotton box, they are vibrated and arranged for uniform output. The output mixed fiber flow directly enters the single beater roll forming machine to make polyester-viscose mixed rolls; Step 4: Carding: Use a carding machine to finely card, open, remove impurities, and form the polyester-viscosity mixed roll obtained in the third step to obtain a polyester-viscosity mixed raw sliver with a strip structure; Step 5: Drawing: The polyester-viscosity mixed raw sliver obtained in the fourth step is drawn and thinned through two drawing steps, and then re-drawn to obtain polyester-viscosity mixed cooked sliver with improved sliver uniformity; Step 6: roving: the polyester-viscosity mixed sliver obtained in the fifth step is drawn, thinned, twisted and wound by a roving machine to obtain polyester-viscosity mixed roving; Step 7: Spinning: The polyester-viscose mixed roving obtained in the sixth step is drawn, thinned, twisted and wound on a spinning machine to obtain the required blended yarn.

2. The method for producing high-quality blended yarn according to claim 1, characterized in that: The electric cotton distributor includes a front branch pipe and a rear merging pipe, the front branch pipe includes a left front branch pipe and a right front branch pipe, the rear end of the left front branch pipe is connected to the combing needle and beater cotton opener in the polyester cotton opening, and the rear end of the right front branch pipe is connected to the combing needle and beater cotton opener in the viscose cotton opening, the front ends of the left front branch pipe and the right front branch pipe are interconnected with the rear end of the rear merging pipe, a left cotton suction fan is arranged at the intersection of the left front branch pipe and the rear merging pipe, and the cotton suction negative pressure of the left cotton suction fan is controlled by the left control valve, and a right cotton suction fan is arranged at the intersection of the right front branch pipe and the rear merging pipe, and the cotton suction negative pressure of the right cotton suction fan is controlled by the right control valve.

3. The method for producing high-quality blended yarn according to claim 1, characterized in that: A cotton condenser is arranged above the rear upper cotton box.

4. The method for producing high-quality blended yarn according to claim 1, characterized in that: A vibrating rod is arranged in the rear upper cotton box.

5. The method for producing high-quality blended yarn according to claim 1, characterized in that: A first output roller is arranged at the bottom of the rear upper cotton box, and the first output roller is controlled by a first switch.

6. The method for producing high-quality blended yarn according to claim 5, characterized in that: A first photoelectric tube is arranged in the rear lower cotton box. When the first photoelectric tube detects that the height of the mixed fiber layer in the rear lower cotton box is less than a set value, the first switch controls the first output roller to rotate so as to realize the transportation of the polyester and viscose mixed fibers in the rear upper cotton box to the rear lower cotton box. When the first photoelectric tube detects that the height of the mixed fiber layer in the rear lower cotton box is greater than a set value, the first switch controls the first output roller to stop rotating so as to stop the transportation of the polyester and viscose mixed fibers in the rear upper cotton box.

7. The method for producing high-quality blended yarn according to claim 1, characterized in that: A second output roller is arranged at the bottom of the rear lower cotton box, and the second output roller is controlled by a second switch. The cotton delivery curtain is arranged at the bottom of the second output roller, and the rear end of the cotton delivery curtain is located in the rear lower cotton box, and the front end is located in the middle cotton box.

8. The method for producing high-quality blended yarn according to claim 1, characterized in that: The corner nail curtain is arranged in the middle cotton box, and the corner nail curtain is arranged in a vertically inclined state. The corner nail curtain is driven to rotate by the second motor. The angle between the bottom end of the corner nail curtain and the front end of the cotton feeding curtain is between 90 and 120 degrees. The top end of the corner nail curtain is located in the front cotton box. A cotton stripping roller is arranged on the upper part of the top end of the corner nail curtain. The cotton stripping roller is controlled by the third switch to rotate or stop rotating.

9. The method for producing high-quality blended yarn according to claim 8, characterized in that: A second photoelectric tube is arranged in the front cotton box. When the second photoelectric tube detects that the height of the mixed fiber layer in the front cotton box is less than a set value, the third switch controls the cotton stripping roller to rotate so as to realize the conveying of the polyester-viscose mixed fiber grabbed by the corner nail curtain into the front cotton box. When the second photoelectric tube detects that the height of the mixed fiber layer in the front cotton box is greater than a set value, the third switch controls the cotton stripping roller to stop rotating so as to stop the conveying of the polyester-viscose mixed fiber in the middle cotton box.

10. The method for producing high-quality blended yarn according to claim 1, characterized in that: A vibration plate is arranged in the front cotton box.

Images